Don't depend on String8 cast to C string

Bug: 295394788
Test: m checkbuild
Change-Id: I6aa039b6b2a4944e3537ef133f8785890d957edd
diff --git a/tools/aapt/tests/AaptGroupEntry_test.cpp b/tools/aapt/tests/AaptGroupEntry_test.cpp
index bf5ca59..8621e9b 100644
--- a/tools/aapt/tests/AaptGroupEntry_test.cpp
+++ b/tools/aapt/tests/AaptGroupEntry_test.cpp
@@ -24,7 +24,7 @@
 
 static ::testing::AssertionResult TestParse(AaptGroupEntry& entry, const String8& dirName,
         String8* outType) {
-    if (entry.initFromDirName(dirName, outType)) {
+    if (entry.initFromDirName(dirName.c_str(), outType)) {
         return ::testing::AssertionSuccess() << dirName << " was successfully parsed";
     }
     return ::testing::AssertionFailure() << dirName << " could not be parsed";